Dr. Ken Hansraj, a spinal and orthopedic surgeon in Poughkeepsie, New York, found that the adult head only weighs around 12lbs (5.4kg) when upright.

But the force exerted on the spine can surge to up to 60lb (27kg) when the head is tilted forward by 60 degrees – as it often is when looking at a mobile phone – leading to ‘early wear, tear, degeneration and possibly surgeries.’